Static structures (e.g. – buildings) – Installed screed or unit with specified feature retaining... – Stonelike material base type; e.g. – concrete set
Patent
1993-09-07
1995-07-18
Mai, Lanna
Static structures (e.g., buildings)
Installed screed or unit with specified feature retaining...
Stonelike material base type; e.g., concrete set
52371, E04B 200
Patent
active
054330513
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a supporting element with elongate form for use in casting concrete floors on a foundation, said support element comprising a base member and a top member with a sliding plane surface to allow a concrete-levelling device carried by the supporting element to be moved along the sliding plane surface.
Known supporting elements of the type described in the introduction consist of beam-like bodies of reinforced concrete, the sliding plane surface thereof usually having a width of 2.5-7 cm. The concrete beams are casted-in to form a part of the finished concrete floor so that the sliding plane surface will be on a level with the surface of the finished concrete floor. A drawback with such casted-in concrete beams is that cracks appear first along one side of the top of the beam and then along the other side. After some years the top of the beam and its sliding plane surface are damaged or destroyed entirely or partly and expensive repair work is necessary. Furthermore, the damages on the top of the beam is accelerated by the trussing irons inside. The grade of concrete used for manufacturing the beams is extremely important. When using such concrete beams, the application of a covering layer is limited as well as securing the trussing irons. Furthermore, the concrete beams can only be used for casting concrete floors on the ground. On other foundations such as ceilings there is insufficient cohesion between fresh and solidified concrete since the concrete beam separates them. In foundations formed of casettes, i.e. prefabricated joist frames of concrete, steel or light concrete, problems may arise with the adhesion between concrete beam and casette. Another problem is that levelling of the concrete beams is relatively time-consuming and complicated since the beams are heavy and are positioned in fresh concrete which must solidify before casting can be performed. Furthermore, handling of the concrete beams during manufacture, storage at the factory, transportation, storage at the retailer and on site, is relatively expensive due to their fragility and high weight.
The object of the present invention is to provide a supporting element which greatly reduces the above-mentioned problems; which has low weight and is thus easily handled; which can be quickly and easily levelled ensuring that the sliding plane surface is at the desired level; which reduces the risk of cracks in the finished concrete floor; which allows great freedom in mounting trussing irons; and which is not limited to casting on the ground but can also be used when casting casettes and ceilings.
The invention is characterized substantially in that the supporting element comprises two longitudinal, form stable side walls defining between them a longitudinal space, and that at least one of the side walls is provided with a plurality of through-holes disposed to permit fresh concrete to flow through into said space during said casting, so that the space is filled with concrete.
The invention will be described further in the following, with reference to the accompanying drawings.
FIG. 1 is a perspective view of a supporting element according to a first embodiment of the invention.
FIG. 2 is an end view of the supporting element according to FIG. 1.
FIG. 3 is a perspective view of a supporting element according to a second embodiment of the invention.
FIG. 4 is an end view of the supporting element according to FIG. 3.
FIGS. 5-7 are end views of supporting elements according to three further embodiments of the invention.
FIG. 8 is a view from above of part of a foot portion with screw, of the supporting element according to FIGS. 3 and 4.
FIG. 9 is a section along the line IX--IX in FIG. 8.
The supporting element shown in FIGS. 1 and 2, generally denoted screed, has an elongate, rail-like form and comprises a base member 1 intended to face downwardly to the foundation on which a concrete floor is to be casted, and a top member 2 having an upwardly facing sliding plane surface 3 on which a concrete-levelling device is inte
REFERENCES:
patent: 1110369 (1914-09-01), Bagnall et al.
patent: 2156027 (1939-04-01), Preble
patent: 2679156 (1954-05-01), McFarland
patent: 3222040 (1965-12-01), Eckert
patent: 3295268 (1967-01-01), Gaither
patent: 4909002 (1990-03-01), Clifton et al.
Combiform Aktiebolag
Mai Lanna
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